Sidewalk-elevator door.



o. s. HOPFMANQ- I SIDEWALK ELEVATOR DOOR; l

APPLIcATIoN FILED Nov. 2s. lgoj Patented July 1909.

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CHARLES S. HOFFMAN, OF SAN FRANCISCO, CALIFORNIA.

SIDEWALK-ELEVATOR DOOR.

To all whom it may concern:

Be it known that I, CHARLEs S. HOFFMAN, a citizen of the United States, and a resident of the city and county of San Francisco and State of California, have invented a new and useful Improvement in Sidewalk-Elevator Doors, of which the following is a specificaw tion.

This invention relates to improvements made in metal frames and doors of elevator hatchways, or o enings in a sidewalk through which merchandise is handled.

The object of the invention is chiefly to provide a frame and door for sidewalk openings in which the hinges will be situated within the frame and below the surface, and the doors when closed will be i'lush withthe side-walk, presenting a smooth level surface even with the top of the sidewalk.

The object of the inventionis further the production of a light and strong Cloonframe simple and ineXp ensive in construction ad ap ted to set in a concrete sidewalk and to be inclosed by the concrete but leaving the hinges of the doors uncovered, and accessible when the doors are opened.

These and other objects are attained in and by the construction and combination of parts as hereinafter described and pointed out in the claims.

The accompanying drawing referred to in this specification illustrates a sidewalkdoor of my invention, having two doors.

Figure 1 is a plan or top-view of the complete frame with one door closed, the other 'door being removed to expose the frame X.

Fig. 2 is a longitudinal sectienabview through .oc-x Fig. 1. Fig. 3 is a detail on an enlarged scale of a portion of the frame at one corner embedded in the concrete and showing the manner of placing and joining the members of thel frame and the construction of the hinge. Figs. 4 and 5 are details of the hinge; Fig. 4 being a top-view of the pintle-bar and Fig. 5 an end-view of the same part.

A novel feature in constructing a door frame of my invention for a sidewalk-elevator consists in forming it of the channel-bars ct and the angle-bars l) laid together and united by rivets c so as to produce a rectangular frame with an inner standing rim 2 and an outer standing rim 3 inclosing two deep grooves or channels 4 5, extending around the four sides of the frame. These two channels are formed by setting the angleiron member b of the frame in the channel- Specification of Letters Patent.

Application led November 28, 1908.

Patented .Tuly 20, 1909.

Serial No. 464,869.

iron member with the horizontal iiange 6 of the angle-iron turned outward and resting against the outer 'flange of the channel-iron, and riveting through the flange and the bottom of the channel-iron. The upright flange of the angle-iron being wider than the'ilange of the channel-iron extends above the top of the inner and the outer rim of the frame and forms the standing sides and ends of the opening in which thedoors -c are itted and make a close joint therewith.

in joining the 'longitudinal members and the transverse members of the frame, the standing flanges 2 of the inner rim are cut away as seen at 10-12, 10-13, Fig. 1, at the point of intersection of the -two flanges for the purposes of producing a continuous channel around the four sides of the frame; but the longitudinal angle-irons on the contrary are carried out to the end; and have the transverse members set in between them, it being only important that the inner chan nel should continue around the four sides to form a continuous channel and not the outer channel, as the inner one is intended to form a gutter for catching and carrying on' the fwater, while the outer channel is filled up 'with the concrete. As thus constructed the frame is formed wholly of the longitudinal and transverse channel-iron members, with the angle-iron members set in and united thereto.

The doors cZ-e are of pro er dimensions to fit into the opening inclose by the standing franges of the angle-iron members and they are attached to the frame by pivot-hinges comprising pintles f-g, on opposite sides of the door, and sockets or holes 14 in the standing flanges of the angle-irons a longer bearing for each pintle than that which would be furnished by the thickness of the standing flange of the angle-iron being provided by riveting a bearing-block 15 on the side of the flange. The pintles for each door are prefer* ably formed on the ends of a flat bar 16 which is fastened to the underside of the door by countersunk rivets 17 and the pintles being 'fitted to circular holes or sockets 14 in the flange and bearing blocks are slipped into place and the door attached to the frame before the transverse members of the frame are placed and the members drawn together for riveting. The pintles are set in such close relation to the top edge of the standing` liange that the door when turned down will be level with the rim around the opening which is formed by the standing flange 3, and the top surface of the door will be fiush with that rim with no part standing above such surface. To bring the pintles within the top of the frame so as to be covered by the door, they are formed as described on the end of a flat bar which is fastened in place by riveting it to the underside of the door. A door frame of this construction permits the concrete to be filled in and laid closely to the door opening without a break, and covering all parts of the frame, so that only the standing rim around the doors is exposed, and the concrete surface can be brought up to and finished closely to the frame-Without break or interruption or division in the surface of the sidewalk. This description of the doorconstruction applies to both doors, w ien `the frame is of such size of opening as to require two doors in which construction a supporting bar is provided under the meeting edges of the two doors, as shown in l'igs', l and 2. This support is a.bar 1S on the underside of one of the doors secured thereto so as to be carried out of the Way when the door is raised, and to be brought in place across the opening when the door is closed. It is permanently fixed on that account to one door, and is formed with a gutter portion extending under the joint formed by the meeting edges of the two doors in order to catch water that may leal; tl rough the joint, and conduct it to the channel in the frame; the ends of the bar extend over the inner standing rim 2 to discharge the water into the trough and resting on the rim serve to support the doors in the VCenter of the opening. Nhere additional support for the doors is found necessary they are provided with bearing blocks or strips 19 riveted to the underside and placed in position to rest on the inner rim 2 of the frame when the door is closed.

From the foregoing description the novel feature of this invention will be seen to comprise the construction of the frame of channel-iron members and angle-iron members laid and oined together so as to form or inclose an inner channel or trough with a standing rim to support the doors, and an outer channel for the concrete or material of which the sidewalk is laid; also the manner of pivotally hanging and supporting the doors in the frame by which the pivots are situated within the frame and below the top surface and are also accessible when the doors are opened.

I claim 1. A frame for sidewalk elevator openings, comprising longitudinal channel-iron members, transverse channel-members arranged in a rectangular frame in combination with angle-iron members laid in the said channeliron members with their' horizontal flanges turned outwardly and secured to the bottom of the channel and their upright members eX- tending above the top edge of the innerstanding 'liange of the channel-iron members.

2. ln a frame and doors for side-walk elevators, the combination of channel-iron members and angle-iron members arranged in a rectangular frame, the angle-iron members being secured in the channel-iron members whereby the trough inclosed between the standing fianges of the channel-ircn is divided into an inner channel and an outer channel around the sides of the frame, the upright flange of the angle--iron members ei;- tending from the bottom of the channel above the top edges of the channel-iron flanges, and doors pivotally attached to the said upright iianges of the angle-iron members and adapted to be flush with the top edge of the standing rim surrounding the elevator opening when the doors are closed.

CHARLES S. HOFFMAN.

l/Vitnesses: Y

M, REGNER, EfE. OsoRN. 

